Integration of the Cervical Proprioceptive Signals in Patients With Cervical Dystonia

Inclusion criteria: * patients presenting focal or segmental cervical dystonia diagnosed by a neurologist expert in the diseases with abnormal movements * having signed a consent for study participation No Inclusion Criteria: Neurological affection other than cervical dystonia (typical or atypical parkinsonism, other ...) * Severe pain, trauma or disease of the cervical spine known or suspected other than cervical dystonia requiring treatment in the last 6 months * Ongoing neuroleptic treatment * Pregnancy or breastfeeding * Lack of insurance coverage For patients, are added the following no inclusion criteria are added: * Trembling cervical dystonia * Injection of botulinum toxin in the past three months